Question

Diberikan fungsi f(x) = ax + b.jika f(-5) = -8 dan f(3) = 16, tentukan :
a. nilai a dan b
b. rumus fungsinya
c, nilai f(-3)

Answer 1

F(-5)= -8
-5a+b= -8

f(3)= 16
3a+b= 16

   -5a+b= -8
     3a+b= 16  -
⇔ -8a    = -24
⇔  a      = -24 ÷ -8
⇔  a      = 3

   -5a+b = -8
⇔-5(3)+b = -8
⇔ -15+b  = -8
⇔  b        = -8 + 15
⇔ b      = 7


rumus fungsi = ax + b
                   = 3x + b

f(-3) = 3(-3) + 7
       = -9 + 7
       = -2

Answer 2

A. nilai a =3
nilai b = 7

b. f(x) -> 3a+7
c. f (-3) =-2